(1) The Bluett family site at http://bluett.com contains a page on the Descendants of the Walter Bloet (Bluett) which appears to have been prepared by Valerie White who is to be congratulated for her work on this family. That page has been used as the Main Source for this family. Sadly, the sources used by that site have not been identified but a review of the page on 15.02.19 using Vivian's work confirmed the view (previously obtained from cross-references to the famly from other sources) that the site is reasonably reliable. However, we view the early generations with caution.
(2) Vivian spells the family name as Blewett.
The site suggests that the name Bloet is of Viking orgin. Wikipedia ("Robert Bloet") reports that the undermentioned Bishop of Lincoln was "a member of the Norman noble family that held Ivry in Normandy". The first mentioned in the family site is ...

Walter Bloet

1.

William Bloet (a 1066, to England with William the Conqueror)

William is the first mentioned by Vivian who identifies him, wrongly/misleadingly, as 'Earl of Salisbury'.